Add code to terminal

See this page for adding the code command so VSCode can be launched from terminal:

code some_directory

Choose tab

Control + [Tab number]

Go to definition

Usually you can Cmd + Click or use F12

Go back from defintion

Preferences > Keyboard Shortcut > workbench.action.navigateBack:

Cntrl + -

List all functions in a script

Preferences > Keyboard Shortcut > workbench.action.gotoSymbol:

Cmd + Shift + O
(optionally then type ':')